Chester f



C. F. JOHNSON.

HYDROCARBON MOTOR.

APPLICATION FILED APR. 1:, 19m.

Patented May10;1921.

A 1 l l s 1 INVENTORI To all whom it may concern;

g, UNITED STATES PATENT OFFICE.

OHESTER F. JOHNSON, OF DETROIT, MICHIGAN, ASSIGNOR T0 GENERAL MOTORS COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF NEW JERSEY.

HYDROGARBON-MOTOR.

Be it knownth'at I, CHESTER F. J OHNSON, a citizen of the United States, and resident of Detroit, Wayne'county, State of Michigan, have invented certain new and useful Improvements in Hydrocarbon-Motors, of which the following is a specification.

This invention relates to hydrocarbon motors and more particularly to improvements in heating devices therefor.

One of the objects of this invention is to provide simple means for maintaining the combustion chamber of an internal combustion engine, at a desired temperature.

Another object of this invention is to provide a hydrocarbon motor with a heater device, located where it will either efi'ectively maintain, orraise to a desired temperature, the combustible mixture which is to be ignited.

Another object of my invention is to provide a simple and effective heater so arranged and located in an internal combustion engine, that it will maintain the combustible mixture adjacent the igniting device at a predetermined temperature.

Another object of my invention is to provide a suitable heater, located in the combustion chamber of a hydro-carbon motor.

Another object of my invention is to provide an electric heater coil, arranged in the path of the combustible gases as they enter the explosion chamber of a hydrocarbon motor.

These, and various other objects, will more clearly appear from the following description, taken in connection with the accompanying drawings, which form a part of this specification, and in which Figure 1 illustrates a longitudinal vertical section through a portion of a hydrocarbon motor, embodying a preferred form of my invention;

Fig. 2 illustrates a vertical section of a 'combustionchamber plug, having a heater element cast therein; and

Fig. 3 illustrates a spark plug, having a heater-coil arranged therein adjacent the gap, between its electrodes.

Referring to the drawings, 10 illustrates a mul'ti-cylinder block, each cylinder of which is provided with an intake port 11 and an exhaust port 12, with a combustion chamber 13 formed adjacent thereto.

These ports are adapted to be controlled Specification of Letters Patent. Patented May 10 1921, Application filed April 11, 1917. Serial No. 161,235.

by the usual puppet valves 1 1-. For facilitating the inspection and removal of the valve portsla, a cap or plug member 15 may be'threaded in position as at 16, over each of the ports. The caps Which are arranged over the intake valves are shown as formed with central openings 17 in which may be threaded a spark plug 18. In the interior of theskirt portion 19 of the plugs 15, which are arranged over the intake port may be detachably mounted, as by loops 20 and screws 21, an insulated coil 22, in which may be arranged, as by oastin a heater element 23. The terminals 24 of the heater element may be led through the plugs to the exterior thereof, and then suitably connected to conductors 25.

With the heater in the position described, when the circuit through the heater is closed, to facilitatestarting in cold Weather, incoming gases will be heated as they enter the combustion chamber through the port 11, and, of course, with the heater in such proximity to the spark gaps, that portion of the gas which is very close to the spark will be quickly brought up to a higher temperature. It will be understood that the coil may be arranged in other locations in the combustion chamber, if desired.

Referring particularly to Fig. 2, it will be noted that the heater coil is shown as formed or cast in the plug, instead of detachably connecting it to the plug 15.

In Fig. 3, the heater element is illustrated as arranged in the interior of the spark plug boss and secured in position by a stamping 26, the upper end of which is adapted to be flared outwardly as at 27, into the recess 28 of the spark plug.

These views merely show various modifications which among others, may be made without departing from the spirit and scope hereof.

Having thus described my invention, what I desire and claim to secure by Let-' ters Patent, is:

1. In an internal combustion engine and in combination with a cylinder having a port, a valve cooperating with said port, and an opening formed in the cylinder wall and located adjacent said port and through which opening said valve may be removed from its seat; a cap or plug member secured in place within said openlng and having a threaded orifice in its end wall adapted to receive a spark plug; and a heating coil carried by said cap and located within the engine cylinder and surrounding the orifice aforesaid in said cap member.

2. In an internal combustion engine and in combination with a cylinder having a port, a valve cooperating with said port, and an opening formed in the cylinder wall and located adjacent said port and through which opening said valve may be removed from its seat; a cap or plug membersecured in place within said opening; and an annular heating member carried by said cap and located within the engine cylinder.

3. In an internal combustion engine and in combination with a cylinder having a port, a valve cooperating with said port, and an opening formed in the cylinder wall; a cap or plug member secured in place within said opening and having a threaded orifice in its end wall adapted to receive a spark plug; and a heating member carried by said cap and located within the engine cylinder and surrounding the orifice aforesaid provided for said s ark plug.

In testimony whereof alfix my signature.

CHESTER F. J OHNSDN. 

